Malicious PDF — malware analysis report

Static analysis result for SHA-256 debc83c32068f68a…

MALICIOUS

PDF

71.8 KB Created: 2020-12-17 22:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ad636413a818a2109a586b927cb71877 SHA-1: 7d3c055ca766671f2b9e9162bcd8ad717e0c24bf SHA-256: debc83c32068f68a2b485db877f921d920d8feb1c8ef24e98be72d3ab025c794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One prominent URL, 'https://traffset.ru/strik?utm_term=kawaii+school+supplies+amazon', is flagged as suspicious. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized document. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/strik?utm_term=kawaii+school+supplies+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409093/normal_5f9fe0b95fb52.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/17b6347054a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458614/normal_5fc5be4da9104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezewu/44870415417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0bd6c9-65d1-4632-b507-9999b3ec9069/trollface_quest_unblocked_weebly.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/dovijewivafade.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/41614072096.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/to_kill_a_mockingbird_city_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb10bda-09c0-4abf-b410-65a4451719c6/the_likeability_factor_by_tim_sanders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0515417e-48f6-4070-ab2b-9d34f9a45db2/99236104621.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/lozukopazebufekep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe5a606-a973-4249-ba23-c60f8ac8c05c/19338613102.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/mumikebozilenatusavofugu.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/57613559824.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 5188 bytes
SHA-256: 0fbdb42fc920949ae94359825754c1a291a70d1cb6d2f93f8518fe205385e71a
font_01_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 11528 bytes
SHA-256: 26318c3a60a646b45714d71e3125aea7b7bc079922e46a25212b814eab365684

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